<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数!" type="warning" :closable="false" show-icon>
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cap_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader v-model="selectCateKeys" :options="cateList" :props="cateProps" expandTrigger="hover" @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button size="mini" type="primary" :disabled="isBTnDisable" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i, scope.row)">{{ item }}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button size="mini" type="primary" :disabled="isBTnDisable" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i, scope.row)">{{ item }}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" @close="addDialogClosed" width="50%">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" @close="editDialogClosed" width="50%">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      //商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定的数组
      selectCateKeys: [],
      //被激活的页签的名称
      activeName: "many",
      //动态参数的数据
      manyTableData: [],
      //静态参数的数据
      onlyTableData: [],
      //控制对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
      //控制编辑对话框的显示与隐藏
      editDialogVisible: false,
      //修改的表单数据对象
      editForm: {
        attr_name: "",
      },
      //修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
      //控制按钮与文本框的切换显示
      inputVisible: false,
      //文本框中输入的内容
      inputValue: "",
    }
  },
  computed: {
    //如果tab按钮需要被禁用 则返回true 否则返回false
    isBTnDisable() {
      if (this.selectCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的id
    cateId() {
      if (this.selectCateKeys.length === 3) {
        return this.selectCateKeys[this.selectCateKeys.length - 1]
      }
      return null
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数"
      }
      return "静态属性"
    },
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories")
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类列表失败")
      }
      this.cateList = res.data
      // console.log(this.cateList);
    },
    //级联选择框选中项变化 会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    //获取参数的列表数据
    async getParamsData() {
      //证明选中的不是三级标签
      if (this.selectCateKeys.length !== 3) {
        this.selectCateKeys = []
        return
      }
      //证明选中的是三级标签
      //根据所选分类的id 和当前所处的面板 获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      )

      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败")
      }
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : []
        //控制文本框的显示与隐藏
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue = ""
      })
      console.log(res.data)
      if (this.activeName === "many") {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //tab页签点击事件的处理函数
    handleTabClick() {
      // console.log(this.activeName)
      this.getParamsData()
    },
    //监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields() //重置表单固定方法
    },
    //添加参数
    addParams() {
      //添加参数之前 需做表单预验证
      this.$refs.addFormRef.validate(async (valid) => {
        // console.log(valid);
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          { attr_name: this.addForm.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败")
        }
        this.$message.success("添加参数成功")
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //编辑对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      )
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败")
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    //关闭按钮 要重置表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //修改参数
    editParams() {
      //修改参数之前 需做表单预验证 refs拿到表单的引用
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败")
        }
        this.$message.success("修改参数成功")
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    //根据id删除对应的参属项
    async removeParams(attr_id) {
      const confirmres = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err)
      //用户取消了删除操作
      if (confirmres !== "confirm") return this.$message.info("已取消删除")
      //否则为 要删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败")
      }
      this.$message.success("删除参数成功")
      this.getParamsData()
    },
    //文本框失去焦点 或摁下了enter键都会触发
    handleInputConfirm() {
      console.log(1)
    },
    //点击按钮 展示文本框
    showInput(row) {
      row.inputVisible = true
      //让文本框自动获得焦点
      // $nextTick 方法的作用：就是当页面上元素 被重新渲染之后 才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //隐藏文本输入框
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ""
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ""
      row.inputVisible = false
      //如果没有return 则说明输入了内容 需做后续处理
      this.saveAttrVals(row)
    },
    //将对attr_vals的操作保存到数据库
    async saveAttrVals(row) {
      //需要发起请求 保存这次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" "),
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error("修改参数项失败")
      }
      this.$message.success("修改参数项成功")
    },
    //删除对应的参数可选项
    handleClosed(i, row) {
      row.attr_vals.splice(i, 1)
      //删除属性后 也需要提交到数据库
      this.saveAttrVals(row)
    },
  },
}
</script>

<style lang="less" scoped>
.cap_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 5px 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
